A:Answer The adapter that comes with the X540L is a universal power adapter.
Input: 120Volt - 240Volt AC, 50/60 Hz, 1.2 Amp
Output: 19 volts DC, 2.37Amps
It should work in any country with the proper plug adapter.
It comes with the standard USA 2 blade, non-polarized, plug.
The battery voltage is probably 18.0 volts so that charger is capable of charging the battery 100% while outputting 19 volts.
The battery is not removable...so can't measure voltage for you.
It is lithium-Ion; the nominal voltage of LI-ION cells is 3.6 volts.
The internal battery is probably made up of 5 Li-ion cells -> 18.0 volts in series
